//拍照 
function getImage() { 
    var c = plus.camera.getCamera(); 
    c.captureImage(function(e) { 
    plus.io.resolveLocalFileSystemURL(e, function(entry) { 
        var s = entry.toLocalURL() + "?version=" + new Date().getTime(); 
        uploadHead(s); /*上传图片*/ 
    }, function(e) { 
        console.log("读取拍照文件错误：" + e.message); 
    }); 
    }, function(s) { 
    console.log("error" + s); 
    }, { 
    filename: "_doc/head.png" 
    }) 
}

//从相册选图上传
function galleryImg() { 
    plus.gallery.pick(function(a) { 
    plus.io.resolveLocalFileSystemURL(a, function(entry) { 
        plus.io.resolveLocalFileSystemURL("_doc/", function(root) { 
        root.getFile("head.png", {}, function(file) { 
            //文件已存在 
            file.remove(function() { 
            console.log("file remove success"); 
            entry.copyTo(root, 'head.png', function(e) { 
                var e = e.fullPath + "?version=" + new Date().getTime(); 
                uploadHead(e); /*上传图片*/ 
                //变更大图预览的src 
                //目前仅有一张图片，暂时如此处理，后续需要通过标准组件实现 
                }, 
                function(e) { 
                console.log('copy image fail:' + e.message); 
                }); 
            }, function() { 
            console.log("delete image fail:" + e.message); 
            }); 
        }, function() { 
            //文件不存在 
            entry.copyTo(root, 'head.png', function(e) { 
                var path = e.fullPath + "?version=" + new Date().getTime(); 
                uploadHead(path); /*上传图片*/ 
            }, 
            function(e) { 
                console.log('copy image fail:' + e.message); 
            }); 
        }); 
        }, function(e) { 
        console.log("get _www folder fail"); 
        }) 
    }, function(e) { 
        console.log("读取拍照文件错误：" + e.message); 
    }); 
    }, function(a) {}, { 
    filter: "image" 
    }) 
}; 

//上传头像图片,图片上传和压缩,转base64 
function uploadHead(imgPath) { 
    console.log("imgPath = " + imgPath); 
    mainImage.src = imgPath; 
    mainImage.style.width = "60px"; 
    mainImage.style.height = "60px"; 

    var image = new Image(); 
    image.src = imgPath; 
    image.onload = function() { 
    var imgData = getBase64Image(image); 
    /*在这里调用上传接口*/ 
//              mui.ajax("图片上传接口", { 
//                  data: { 
//                       
//                  }, 
//                  dataType: 'json', 
//                  type: 'post', 
//                  timeout: 10000, 
//                  success: function(data) { 
//                      console.log('上传成功'); 
//                  }, 
//                  error: function(xhr, type, errorThrown) { 
//                      mui.toast('网络异常，请稍后再试！'); 
//                  } 
//              }); 
    } 
} 
//将图片压缩转成base64 
function getBase64Image(img) { 
    var canvas = document.createElement("canvas"); 
    var width = img.width; 
    var height = img.height; 
    // calculate the width and height, constraining the proportions 
    if (width > height) { 
    if (width > 100) { 
        height = Math.round(height *= 100 / width); 
        width = 100; 
    } 
    } else { 
    if (height > 100) { 
        width = Math.round(width *= 100 / height); 
        height = 100; 
    } 
    } 
    canvas.width = width;   /*设置新的图片的宽度*/ 
    canvas.height = height; /*设置新的图片的长度*/ 
    var ctx = canvas.getContext("2d"); 
    ctx.drawImage(img, 0, 0, width, height); /*绘图*/ 
    var dataURL = canvas.toDataURL("image/png", 0.8); 
    return dataURL.replace("data:image/png;base64,", ""); 
}    
